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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div></div>
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</svg>

<svg>
  <defs>
    <filter id="glow">
      <fegaussianblur class="blur" result="coloredBlur" stddeviation="4"></fegaussianblur>
      <femerge>
        <femergenode in="coloredBlur"></femergenode>
        <femergenode in="SourceGraphic"></femergenode>
      </femerge>
    </filter>
  </defs>
</svg>

<h2>Page Not Found</h2>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Audiowide&display=swap');

html,
body{
  margin: 0px;
  overflow: hidden;
}

div{
  position: absolute;
  top: 0%;
  left: 0%;
  height: 100%;
  width: 100%;
  margin: 0px;
  background: radial-gradient(circle, #240015 0%, #12000b 100%);
  overflow: hidden;
}

.wrap{
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

h2{
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: 150px;
  font-size: 32px;
  text-transform: uppercase;
  transform: translate(-50%, -50%);
  display: block;
  color: #12000a;
  font-weight: 300;
  font-family: Audiowide;
  text-shadow: 0px 0px 4px #12000a;
  animation: fadeInText 3s ease-in 3.5s forwards, flicker4 5s linear 7.5s infinite, hueRotate 6s ease-in-out 3s infinite;
}

#svgWrap_1,
#svgWrap_2{
  position: absolute;
  height: auto;
  width: 600px;
  max-width: 100%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

#svgWrap_1,
#svgWrap_2,
div{
  animation: hueRotate 6s ease-in-out 3s infinite;
}

#id1_1,
#id2_1,
#id3_1{
  stroke: #ff005d;
  stroke-width: 3px;
  fill: transparent;
  filter: url(#glow);
}

#id1_2,
#id2_2,
#id3_2{
  stroke: #12000a;
  stroke-width: 3px;
  fill: transparent;
  filter: url(#glow);
}

#id3_1{
  stroke-dasharray: 940px;
  stroke-dashoffset: -940px;
  animation: drawLine3 2.5s ease-in-out 0s forwards, flicker3 4s linear 4s infinite;
}

#id2_1{
  stroke-dasharray: 735px;
  stroke-dashoffset: -735px;
  animation: drawLine2 2.5s ease-in-out 0.5s forwards, flicker2 4s linear 4.5s infinite;
}

#id1_1{
  stroke-dasharray: 940px;
  stroke-dashoffset: -940px;
  animation: drawLine1 2.5s ease-in-out 1s forwards, flicker1 4s linear 5s infinite;
}

@keyframes drawLine1 {
  0%  {stroke-dashoffset: -940px;}
  100%{stroke-dashoffset: 0px;}
}

@keyframes drawLine2 {
  0%  {stroke-dashoffset: -735px;}
  100%{stroke-dashoffset: 0px;}
}

@keyframes drawLine3 {
  0%  {stroke-dashoffset: -940px;}
  100%{stroke-dashoffset: 0px;}
}

@keyframes flicker1{
  0%  {stroke: #ff005d;}
  1%  {stroke: transparent;}
  3%  {stroke: transparent;}
  4%  {stroke: #ff005d;}
  6%  {stroke: #ff005d;}
  7%  {stroke: transparent;}
  13% {stroke: transparent;}
  14% {stroke: #ff005d;}
  100%{stroke: #ff005d;}
}

@keyframes flicker2{
  0%  {stroke: #ff005d;}
  50% {stroke: #ff005d;}
  51% {stroke: transparent;}
  61% {stroke: transparent;}
  62% {stroke: #ff005d;}
  100%{stroke: #ff005d;}
}

@keyframes flicker3{
  0%  {stroke: #ff005d;}
  1%  {stroke: transparent;}
  10% {stroke: transparent;}
  11% {stroke: #ff005d;}
  40% {stroke: #ff005d;}
  41% {stroke: transparent;}
  45% {stroke: transparent;}
  46% {stroke: #ff005d;}
  100%{stroke: #ff005d;}
}

@keyframes flicker4{
  0%  {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  30% {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  31% {color: #12000a;text-shadow:0px 0px 4px #12000a;}
  32% {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  36% {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  37% {color: #12000a;text-shadow:0px 0px 4px #12000a;}
  41% {color: #12000a;text-shadow:0px 0px 4px #12000a;}
  42% {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  85% {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  86% {color: #12000a;text-shadow:0px 0px 4px #12000a;}
  95% {color: #12000a;text-shadow:0px 0px 4px #12000a;}
  96% {color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
  100%{color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
}

@keyframes fadeInText{
  1%  {color: #12000a;text-shadow:0px 0px 4px #12000a;}
  70% {color: #ff005d;text-shadow:0px 0px 14px #ff005d;}
  100%{color: #ff005d;text-shadow:0px 0px 4px #ff005d;}
}

@keyframes hueRotate{
  0%  {
    filter: hue-rotate(0deg);
  }
  50%  {
    filter: hue-rotate(-120deg);
  }
  100%  {
    filter: hue-rotate(0deg);
  }
}
!

JS
!
999px

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